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08-31-2011, 08:20 PM
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#1 (permalink)
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DSM Wiseman
From: OKC, Oklahoma
Registered: Sep 2003
Reputation: 
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The 1990 Engine Control Wiring Harness
*****IMPORTANT***** Note that the wire color layout diagrams accompanying each picture are as seen FROM the CONTROL HARNESS SIDE of the connector with the release tab (for a male side connector) or locking notch (for a female side connector) on top. That is, you are looking at the wires going into the connector, OPPOSITE the side that is pictured. Like this: How to identify ECU pin numbers.
*******************
As we all know, the 1990 model year had many quirks to it when compared to the later model 1Gs. Because this was a single (and the first) year of the Eclipse/Talon/Laser trio, information on these cars isn’t nearly as abundant as 1991-1994 models.
I don’t plan to dive into and explain the differences between these models as there are plenty of threads around naming the differences. In short, this article is a configuration diagram. It aims to familiarize members with the 1990 4G63 turbo engine control harness electrical connections, similar to what snowborder714 did in his 2g Engine Bay Electrical Connections article, but not nearly as thorough. To be clear, this article does not cover every electrical connection in the 1990 engine bay, only those on the engine control harness, including the handful of interior connections.
As a couple extras, it will touch on some connector differences that must be attended to when swapping a 1990 turbo engine control harness into a later model 1G or vice versa (these are denoted by **). It lists original wire colors and original individual wire locations as viewed from the wire side of the connector as well as a visual of each connector on the harness.
Also, for comparison, here is a similar page for the later model 1Gs (those connectors labeled with * are either completely different, in a different location, or non-existent on the later model 1Gs): 1Gb DSM 4G63 Turbo Wiring Harness Diagram
First and foremost, the main harness itself. The alphanumeric identifiers relate to those in the 1991 configuration diagram found in the electronic copy of the factory service manual: Download the 1G Service Manuals. The harness displayed here is a 1990 turbo engine harness which, by consequence, means it is from a vehicle with a manual transmission.
Click to enlarge slightly or zoom by pressing Control and + (the plus sign):
To shrink, press Control and - (the minus or negative sign).
A-08: Dual Pressure Switch
A-09: Wiper Motor
A-10: Control Wiring Harness and Battery Cable Assembly Combination
*A-11: Auto-Cruise Control Vacuum Pump
A-12: Brake Fluid Level Sensor
A-13: Control Wiring Harness and Solenoid Valve Harness Assembly Combination
A-36: Air Flow Sensor
A-51: Waste Gate Solenoid
A-52: Control Wiring Harness and Engine Compartment Wiring Harness Combination
A-53: Control Wiring Harness and Engine Compartment Wiring harness Combination
A-55: Fuel Pump Check Connector
A-56: Noise Condenser
A-57: Defogger Relay
A-58: Injector Resistor Pack
A-59: Engine Speed Adjustment Connector
A-60: Ignition Timing Adjustment Connector
*B-00: Noise Filter (for Tachometer)
B-01: Injector No. 4
*B-02 & B-05: Throttle Position Sensor and Idle Switch
B-04: Idle Speed Control Actuator
B-06: Injector No. 3
B-07: Detonation (Knock) Sensor
B-08: EGR Temperature Sensor
B-09: Injector No. 2
B-10: Injector No. 1
*B-14: Ignition Coil (Coil Pack)
*B-15: Power Transistor Unit
B-16: A/C Magnetic Clutch
B-26: Oxygen Sensor
B-29: Engine Coolant Temperature Gauge Unit
B-30: Engine Coolant Temperature Sensor (for ECU)
B-31: Engine Coolant Temperature Switch (for A/C)
*B-32: Crank Angle and Top Dead Center Sensor (Cam Angle Sensor, CAS)
C-56: Oxygen Sensor Check Connector
C-57: Control Wiring Harness and Body Wiring Harness Combination (1-pin, passenger side kick panel)
**C-58: Control Wiring Harness and Body Wiring Harness Combination (14-pin, passenger side kick panel)
C-59: Control Wiring Harness and Body Wiring Harness Combination (6-pin, passenger side kick panel)
C-63: MPI Control Relay
C-64: MPI Control Unit (ECU, small connector)
C-65: MPI Control Unit (ECU, medium connector)
**C-66: MPI Control Unit (ECU, large connector)
**C-67: Control Wiring Harness and Body Wiring Harness Combination (under center console)
The wire color layout diagrams accompanying each picture are as seen FROM the HARNESS SIDE of the connector with the release tab (for a male side connector) or locking notch (for a female side connector) on top. They should be color coded correctly, but if there is a disagreement with the letters and the color of the letters, go by the letters. When two colors are listed together, the first is the main color and the second is the color of the stripe or tracer. The letters represent the following colors:
B - Black
W - White
R - Red
G - Green
L - Blue
Y - Yellow
O - Orange
Lg – Light Green
PM me if you find any errors and I will make corrections as necessary.
____________________________
Brian
Last edited by 19Eclipse90; 10-14-2012 at 08:09 PM.
Reason: Enlarged wire color diagrams in all posts and location numbers in the layout diagram.
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08-31-2011, 08:22 PM
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#2 (permalink)
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DSM Wiseman
From: OKC, Oklahoma
Registered: Sep 2003
Reputation:
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A-08: Dual Pressure Switch
____________________________
Brian
Last edited by 19Eclipse90; 10-21-2011 at 08:36 PM.
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08-31-2011, 08:23 PM
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#3 (permalink)
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DSM Wiseman
From: OKC, Oklahoma
Registered: Sep 2003
Reputation:
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A-09: Wiper Motor
____________________________
Brian
Last edited by 19Eclipse90; 10-21-2011 at 08:38 PM.
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08-31-2011, 08:24 PM
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#4 (permalink)
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DSM Wiseman
From: OKC, Oklahoma
Registered: Sep 2003
Reputation:
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A-10: Control Wiring Harness and Battery Cable Assembly Combination
Quote:
Originally Posted by 19Eclipse90
The two black w/ yellow wires are involved in the starting circuit and run to the starter motor/solenoid. The red and red w/ blue wire are for the reverse lights sensor.
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____________________________
Brian
Last edited by 19Eclipse90; 03-02-2012 at 06:30 PM.
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08-31-2011, 08:25 PM
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#5 (permalink)
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DSM Wiseman
From: OKC, Oklahoma
Registered: Sep 2003
Reputation:
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*A-11: Auto-Cruise Control Vacuum Pump
One of the mystery connectors that seems to come up relatively frequently, 1990 models had the cruise control unit in front of the battery instead of on the firewall like the 1991+ models.
____________________________
Brian
Last edited by 19Eclipse90; 10-21-2011 at 08:41 PM.
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08-31-2011, 08:26 PM
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#6 (permalink)
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DSM Wiseman
From: OKC, Oklahoma
Registered: Sep 2003
Reputation:
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A-12: Brake Fluid Level Sensor
____________________________
Brian
Last edited by 19Eclipse90; 10-21-2011 at 08:42 PM.
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08-31-2011, 08:27 PM
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#7 (permalink)
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DSM Wiseman
From: OKC, Oklahoma
Registered: Sep 2003
Reputation:
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A-13: Control Wiring Harness and Solenoid Valve Harness Assembly Combination
____________________________
Brian
Last edited by 19Eclipse90; 10-21-2011 at 08:43 PM.
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08-31-2011, 08:28 PM
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#8 (permalink)
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DSM Wiseman
From: OKC, Oklahoma
Registered: Sep 2003
Reputation:
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A-36: Air Flow Sensor
The picture below is for a turbo MAF. A non-turbo harness has only six wires (in two rows of three) running to it -- the one that will not be present is the green with white stripe which runs to pin 14 on C-66.
____________________________
Brian
Last edited by 19Eclipse90; 07-07-2012 at 07:00 PM.
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08-31-2011, 08:29 PM
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#10 (permalink)
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DSM Wiseman
From: OKC, Oklahoma
Registered: Sep 2003
Reputation:
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A-52: Control Wiring Harness and Engine Compartment Wiring Harness Combination
____________________________
Brian
Last edited by 19Eclipse90; 10-21-2011 at 08:47 PM.
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08-31-2011, 08:30 PM
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#11 (permalink)
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DSM Wiseman
From: OKC, Oklahoma
Registered: Sep 2003
Reputation:
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A-53: Control Wiring Harness and Engine Compartment Wiring harness Combination
____________________________
Brian
Last edited by 19Eclipse90; 10-21-2011 at 08:48 PM.
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08-31-2011, 08:31 PM
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#13 (permalink)
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DSM Wiseman
From: OKC, Oklahoma
Registered: Sep 2003
Reputation:
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A-56: Noise Condenser
____________________________
Brian
Last edited by 19Eclipse90; 10-21-2011 at 08:50 PM.
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08-31-2011, 08:32 PM
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#14 (permalink)
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DSM Wiseman
From: OKC, Oklahoma
Registered: Sep 2003
Reputation:
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A-57: Defogger Relay
____________________________
Brian
Last edited by 19Eclipse90; 10-21-2011 at 08:51 PM.
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08-31-2011, 08:33 PM
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#15 (permalink)
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DSM Wiseman
From: OKC, Oklahoma
Registered: Sep 2003
Reputation:
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A-58: Injector Resistor Pack
Make sure not to confuse this with B-04: Idle Speed Control Actuator.
____________________________
Brian
Last edited by 19Eclipse90; 05-31-2012 at 02:02 PM.
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08-31-2011, 08:34 PM
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#16 (permalink)
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DSM Wiseman
From: OKC, Oklahoma
Registered: Sep 2003
Reputation:
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A-59: Engine Speed Adjustment Connector
____________________________
Brian
Last edited by 19Eclipse90; 10-21-2011 at 08:53 PM.
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08-31-2011, 08:34 PM
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#17 (permalink)
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DSM Wiseman
From: OKC, Oklahoma
Registered: Sep 2003
Reputation:
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A-60: Ignition Timing Adjustment Connector
____________________________
Brian
Last edited by 19Eclipse90; 10-21-2011 at 08:54 PM.
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08-31-2011, 08:35 PM
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#18 (permalink)
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DSM Wiseman
From: OKC, Oklahoma
Registered: Sep 2003
Reputation:
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B-00: Noise Filter (for Tachometer)
For good measure, you can check this link to see what, exactly, connects here. If this is missing, your 1990 tachometer will not work: Rpm Gauge
Fortunately, there are ways to get around having the filter. Check this useful article out for details: How To: Fix a 1990 DSM tach..
____________________________
Brian
Last edited by 19Eclipse90; 10-21-2011 at 08:54 PM.
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08-31-2011, 08:36 PM
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#19 (permalink)
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DSM Wiseman
From: OKC, Oklahoma
Registered: Sep 2003
Reputation:
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B-01: Injector No. 4
____________________________
Brian
Last edited by 19Eclipse90; 10-21-2011 at 08:55 PM.
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08-31-2011, 08:37 PM
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#20 (permalink)
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DSM Wiseman
From: OKC, Oklahoma
Registered: Sep 2003
Reputation:
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B-02 & B-05: Throttle Position Sensor and Idle Switch
The 1990 model integrated the idle switch into the throttle position sensor connector. When using a 1991+ throttle body, the green wire in the dotted box would need to run to the idle switch. For a write up on this site: 1990 Swap to 91-94 Throttle Body
____________________________
Brian
Last edited by 19Eclipse90; 10-21-2011 at 09:29 PM.
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08-31-2011, 08:38 PM
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#21 (permalink)
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DSM Wiseman
From: OKC, Oklahoma
Registered: Sep 2003
Reputation:
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B-04: Idle Speed Control Actuator
Make sure not to confuse this with A-58: Injector Resistor Pack on a turbo vehicle.
____________________________
Brian
Last edited by 19Eclipse90; 09-09-2012 at 07:36 AM.
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08-31-2011, 08:39 PM
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#22 (permalink)
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DSM Wiseman
From: OKC, Oklahoma
Registered: Sep 2003
Reputation:
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B-06: Injector No. 3
____________________________
Brian
Last edited by 19Eclipse90; 10-21-2011 at 09:00 PM.
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08-31-2011, 08:40 PM
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#23 (permalink)
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DSM Wiseman
From: OKC, Oklahoma
Registered: Sep 2003
Reputation:
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B-07: Detonation (Knock) Sensor
Note the color ( gray ) of this connector / connection / plug; it is the same for all turbo DSMs and is the only connector of this color in the 1G engine compartment.
____________________________
Brian
Last edited by 19Eclipse90; 10-07-2012 at 03:08 PM.
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08-31-2011, 08:40 PM
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#24 (permalink)
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DSM Wiseman
From: OKC, Oklahoma
Registered: Sep 2003
Reputation:
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B-08: EGR Temperature Sensor
____________________________
Brian
Last edited by 19Eclipse90; 10-21-2011 at 09:02 PM.
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08-31-2011, 08:41 PM
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#25 (permalink)
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DSM Wiseman
From: OKC, Oklahoma
Registered: Sep 2003
Reputation:
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B-09: Injector No. 2
____________________________
Brian
Last edited by 19Eclipse90; 10-21-2011 at 09:03 PM.
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08-31-2011, 08:41 PM
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#26 (permalink)
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DSM Wiseman
From: OKC, Oklahoma
Registered: Sep 2003
Reputation:
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B-10: Injector No. 1
____________________________
Brian
Last edited by 19Eclipse90; 10-21-2011 at 09:04 PM.
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08-31-2011, 08:42 PM
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#27 (permalink)
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DSM Wiseman
From: OKC, Oklahoma
Registered: Sep 2003
Reputation:
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B-14: Ignition Coil (Coil Pack)
Four pins compared to three pins for the 1991+, the 1990 has an external tach gate on the coil pack for the tachometer circuit and that fourth wire runs to the noise filter, B-00. See this for more: 1991-1994 ecu swap into a 1990 DSM ignition wiring
____________________________
Brian
Last edited by 19Eclipse90; 10-21-2011 at 09:05 PM.
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08-31-2011, 08:44 PM
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#29 (permalink)
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DSM Wiseman
From: OKC, Oklahoma
Registered: Sep 2003
Reputation:
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B-16: A/C Magnetic Clutch
____________________________
Brian
Last edited by 19Eclipse90; 10-21-2011 at 09:07 PM.
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08-31-2011, 08:44 PM
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#30 (permalink)
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DSM Wiseman
From: OKC, Oklahoma
Registered: Sep 2003
Reputation:
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B-26: Oxygen Sensor
____________________________
Brian
Last edited by 19Eclipse90; 10-21-2011 at 09:08 PM.
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